STM32F303VC datasheet(74/133 Pages) STMICROELECTRONICS

部件名	STM32F303VC

功能描述	ARM Cortex-M4F 32b MCUFPU, up to 256KB Flash48KB SRAM

PDF	133 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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74 / 133 page

Electrical characteristics

STM32F302xx/STM32F303xx

74/133

Doc ID 023353 Rev 5

6.3.7

External clock source characteristics

High-speed external user clock generated from an external source

In bypass mode the HSE oscillator is switched off and the input pin is a standard GPIO. The

external clock signal has to respect the I/O characteristics in Section 6.3.14. However, the

recommended clock input waveform is shown in Figure 14.

Figure 14.

High-speed external clock source AC timing diagram

Table 38.

High-speed external user clock characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSE_ext

User external clock source

frequency(1)

Guaranteed by design, not tested in production.

MHz

VHSEH

OSC_IN input pin high level voltage

0.7VDD

-VDD

VHSEL

OSC_IN input pin low level voltage

VSS

-0.3VDD

tw(HSEH)

tw(HSEL)

OSC_IN high or low time(1)

tr(HSE)

tf(HSE)

OSC_IN rise or fall time(1)

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